Concrete sawing machine



C. W. HATCH ER CONCRETE SAWING MACHINE May 7-, 1957 8 Sheets-Sheet 2 Filed Dec. 1. 1952 cacu. w. HATCHER,

IN VEN TOR.

ATTORNEY.

May 7, 1957 c. w. HATCHER CONCRETE SAWING MACHINE 8 Sheets-$heet 3 Filed Dec. 1. 1952 CECIL w. HATCHER.

INVENTOR.

A 7' TORNE V- c. w. HATCHER CONCRETE SAWING MACHINE May 7, 1957 8 Sheets-$heet 4 Filed Dec. 1, 1952 Y IN V EN TOR.

A T TORNE Y.

CECIL-W. HATCHER N I U C. W. HATCHER CONCRETE SAWING MACHINE.

8 Sheets-Sheet 5 Filed D60. 1. 1952 CECIL W. HATCHER.

IN V EN TOR.

A TTORNEV- May 7, 1957 c. w. HATCHER CONCRETE SAWING MACHINE 8 Sheets-PSheet 6 Filed Dec. 1, 1952 CECIL W. HATCHER,

INVENTOR.

ATTORNEY,

C. W. HATCH ER CONCRETE SAWING MACHINE May 7, 1957 8 Sheets-Sheet 7 Filed Dec. 1, 1952 CECIL W. HATCHER.

IN VEN TOR.

A T TORNE V.

7,;1957 c. w. HATCHER 2,791,412

CONCRETE SAWING MACHINE Filed Dec. 1. 1952 8 Sheiets-Sheet 8 cecu; w. HATCHER,

INVEN TOR.

A T TORNE K CONCRETE SAWING MACHINE Cecil W. Hatcher, Pasadena, Calif., assignor to Content Sales Co. of California, Arcadia, Califl, a partnership Application December 1, 1952, Serial No. 323,363

Claims. (Cl. 262-20) The invention relates to a concrete sawing machine, and more particularly to a machine for sawing a contraction joint in a concrete pavement or highway.

In making a concrete highway, the concrete is usually poured to form a continuous strip of paving which may be of great length, such as a mile or more. Due to expansion and contraction, caused by temperature changes of the weather, an elongated strip of concrete roadway is subject to cracks. These cracks are usually jagged or irregular and increase the maintenance of the pavement. To overcome this, it is customary to saw a slot across the concrete at spaced intervals to control the cracking of the pavement. Also it has been proposed to arrange these slots at an angle other than 90 so that one automobile tire will pass a slot at a difierent time than the opposite tire, for it has been noted that the pavement rises or curls at the joint or slot causing a shock when two or more wheels contact the joint at one time.

Whether the slot is at right angles or otherwise, it is usual to obtain the slot by first marking the concrete where the slot is to appear and then by sawing the slot. This sawing operation involves some inconvenience, as the lateral edges of the pavement have a shoulder so that the wheels of the usual sawing machine, wherein the saw blade rotates in a plane along the path of travel of the machine, cannot ride on the ground outside of the edges of the strip, making it necessary :to advance the cut from the middle of the strip towards one edge, then turn around and advance the cut from the middle of the strip to the opposite edge. These operations involve labor and time and it is an object of the invention to provide a machine which will perform these operations in an improved manner.

A further object of the invention is to provide a concrete sawing machine having a self-propelled carriage having wheels which can ride on the forms at the sides of "the concrete and wherein the saw is laterally movable with respect to the carriage.

A further object of the invention is to provide a con Crete sawing machine wherein each of two saws cuts a connecting portion of a continuous slot, extending the full width and through the opposite sides of the roadway having side forms on which the wheels of the machine run.

A further object of the invention is to provide a con crete sawing machine with means under control of the driver of the carriage for traversing the saws, for raising and lowering the saws. into and out of operative relation to the roadway, and also for adjusting the line of travel of the saws on the carriage'so that they may be either at right angles to the roadway or at a slant thereto, as desired.

A further object of the invention is to provide a concrcte sawing machine which is short in length in propor tion to its Width whereby its width may be kept within the maximum dimension permitted for travel on a high way, while making-it possible tosaw 'a slot having a length companable to the: much greater width of the machine.

nitcd States Patent The machine may thus be transported endwise from place to place, to not interfere with traflic and take up less width of the highway than when travelling head on when the highway is not open to trafiic and when the machine is advanced from slot to slot in the course of the sawing openation. v p

A further object of the invention is to provide a con' creie sawing machine wherein controls for driving the carriage and also controls for operating the saws are arranged so that one operator can both drive the carriage and operate the saws.

Another object is to provide separate controls for rear wheel drives to steer the machine so it rides on the side forms. According to another feature of the invention, guard wheels are provided to prevent injury to the saws if the machine should run off the side forms or the edge of the roadway.

For further details of the invention reference may be made to the drawings wherein Fig. 1 is a plan view of a concrete sawing machine according to the present invention.

Fig. 2 is a front view in elevation, showing the saws in elevated position, looking in the direction of the arrow adjacent 2 at the bottom of Fig. 1.

Figs. 3, 4 and 5 are sectional views on lines of the corresponding numbers in Fig. 2, looking in the direction of the respective arrows, Figs. 4 and 5 being enlarged.

Fig. 6 is a front view in elevation, corresponding to Fig. 2, with parts broken away, and showing the saws in sawing position.

Fig. 7 is a plan view with parts broken away, showing the saw and its track arranged at a slant to the carriage for a slant cut.

Fig. 8 is an enlarged plan view with parts broken away showing certain controls and various devices driven by the engine for the carriage, a rear wheel drive being provided, and one of the rear wheels being shown in secti-on.

Fig. 9 is an enlarged rear view in elevation looking in the direction of the arrow adjacent 9 at the top of Fig. 8, parts being broken away.

Fig. 10 is an enlarged vertical sectional view at the left end of Fig. 8, showing the handles for the brake and other controls.

Fig. 11 is an enlarged perspective view of the left end of the track for the saw, as seen in Figs. 2 and 7, with parts broken away.

Figs. 12 and 13 are sectional views on lines of the corresponding numbers in Fig. 11 looking in the direction of the arrows.

Fig. 14 is an enlarged perspective view of the right end of the saw track, as seen in Figs. 2 and 7, with parts broken away.

Fig. 15 is a sectional view on line 15-15 of Fig. 14 looking in the direction of the arrows.

Fig. 16 is a sectional view on line 16-16 of Fig. 8.

Fig. 17 is a schematic flow diagram of the hydraulic system and controls.

Referring in detail to the drawings, the concrete sawing machine comprises a carriage 1 having front wheels 2 and 3 and rear wheels 4 and 5. The wheels 2 to 5 are adapted to ride on the forms 6 and 7 at the sides of a concrete strip of roadway and are prevented from running off from these forms, as each wheel has a flange like flange 8 for wheel 5. Also each of the wheels 2 to 5 has an axle like 9, as shown for Wheel 2, the inner end of such axle having a smaller guard wheel 16 on which the carriage is adapted to ride, to prevent damage to the saws, in the event that one or more of the wheels like 2 to 5 ride off the forms 6 or 7 due to riding on a piece of concrete or the like.

The rear wheels 4 and 5 each has a brake indicated at 11 and 12, and operated by handle 13 adjacent to the seat 14 for the operator.

Wheel is driven by a sprocket and chain drive indicated at 15 connected to transmission 16, see Fig. 8, and

rear wheel 4 is driven through a similar sprocket and chain drive indicated at 17 driven by transmission 13. Transmissions 16 and 18 are driven by a belt and pulley driven by engine 20. Transmission 16 is operated by bell crank 21 having a handle 22 and transmission 18 is operated by bell crank 23 having a handle 24. Handles 22 and 24 are arranged at the position of the operator on seat 14. The carriage 1 can of course be turned by operating one or the other of handles 22 or 24, while the carriage can be driven straight ahead by operating both of these handles.

The carriage 1 may comprise a frame work of iron angles or channels welded together. Extending transversely of the carriage 1 is a track 25 having parallel rails 26 and 27 constituted by the upper edge of angle iron as shown in Figs. 11, 13 and 14.

As shown in Figs. 14 and 15, the carriage has a main frame channel 28 to which is secured an upright post 29 and one end of the track 25 has welded thereto a sleeve 30 which can pivot on and slide up and down on post 29. Post 29 is supported in a frame 31 having a lug 32 engageable in a notch 33 in a pivoted latch to hold this end of the track 25 in elevated position. Latch 34 is urged to locking positoin by a spring 35 and is released by a cable 36 which runs over a pulley 37. Cable 36 is connected to one end of a bell crank 38, see Fig. 1, operated by a handle 39 at the drivers position 14. The other end of bell crank 38 has a cable 40 to operate a similar latch at the other end of track 25, as shown in Fig. 11. When the track 25 is held in elevated position by the latches 34 and 41, two saws later described are held above the concrete, so that the carriage 1 may be propelled along the road to a new position, without damaging the saws. The track 25 is elevated as follows. As shown in Figs. 14 and 15, that end of track 25 has a hydraulic piston and cylinder pivotally connected, as shown at 43, at its upper end to a bracket 44 welded to the frame 31. The lower end of the hydraulic cylinder 42 is pivotally connected, as shown at 45, to a bracket 46 on track 25. The other end of track 25, as shown in Fig. 11, has a similar hydraulic device 47.

As shown in Fig. 8, engine 20 through a belt 48, drives a pump 49 to supply oil under pressure. As shown in Fig. 17, valve 50 is controlled by a handle 51, see Fig. 8, at the operators position 14. Valve 50 can be shifted to supply oil under pressure to the hydraulic devices 42 and 47 to raise the track 25. When valve 50 is operated to return the oil to the reservoir 52, such exhaust cannot flow through the check valves 53 and 54 but passes through the valves 55 and 56. The valves 55 and 56 are manually adjusted to regulate the flow so that the carriage will descend at the proper low speed.

The back of the piston for the hydraulic devices 42 and 47 could exhaust to atmosphere, except for the fact that it is objectionable to spill oil on the concrete. Hence these devices have pipes 132 and 133 to return leakage to the reservoir 52. The pump 49 is provided with a by-pass 134.

As shown in Figs. 11 to 13, the track 25 at its left end as seen in Fig. 1, has a roller support 63 on the main frame 58 of the carriage, and also a sliding support 59, as the length of the carriage projecting between the sides of the carriage varies with its angular adjustment. For these purposes, as shown in Fig. 12, channels 60 and 61 are arranged at opposite sides of the main frame 58 and connected by axles like 62 welded to channels 60 and 61. Each axle like 62 has a flanged roller like 63 which rides on the channel 58 and embraces its edges. A similar roller 64 engages the bottom of main frame 58. The rollers 63 and 64 are arranged at one end of the channel 61 and a similar pair of upper and lower rollers are arranged at the other end of channel 1, the upper roller appearing at 65 in Fig. 11. Welded to channel 61 are two upright posts 66 and 67, welded at their upper ends to a cross angle channel 68. The cylinder end of hydraulic device 47 is pivotally connected as shown at 69 to cross piece 68, and the piston end thereof is pivotally connected as shown at 70 to a cross member 71 having apertures to loosely engage under shoulders like 72 on a sleeve like 73 which slides on a post like 66. Sleeve 73, and a similar sleeve 74 on post 67, each have welded thereto spaced short sections of angle iron shown at 75 and 76 to embrace and slidably support the horizontal flanges 77 and 78 of the track 26 and 27. The opposite ends of cross member 71 are provided with screws 79 and 80 which engage stops like 81 to limit the descent of the track and limit the depth of cut by the saws.

As shown in Fig. 1, connected to the channels 60 and 61 is the piston rod 82 of a hydraulic cylinder 83. As shown in Fig. 17, the hydraulic cylinder 83 is controlled by a valve 84, the handle 85 for this valve being shown at the bottom left of Fig. 8 and also in Fig. 1, at the operators position 14. By operating the handle 85, the left end of track 25, as seen in Fig. 1, can be angularly adjusted to either make a cut at right angles to the length of the road, as shown in Fig. l, or adjusted at a slant as shown in Fig. 7, to cut a slot at an angle other than As shown particularly in Figs. 1, 2, 6 and 7, riding on the track 25 and suspended thereon by four wheels like 86, is a carriage 90 for the fuel engine 91 which drives the two saws 92, 93 in the same direction by a belt and pulley drive. As shown in Fig. 6, with the saws 92 and 93 rotating counterclockwise, the cut is made, that is the saws are advanced in a direction from right to left as shown by arrow 95, the slots thus cut in the concrete being indicated at 96 and 97. This double saw arrangement, with the saws spaced apart half the width of the concrete, makes it possible to cut a slot substantially 12 long by advancing the saws half of that distance. This dimension is given by way of example, but in any case it is only necessary to advance the saws for half the total length of the slot.

As shown in Fig. 7, the saws 92 and 93 are in the same plane, so that the slot 96, see Fig. 6, joins with the slot 97, to form a continuous slot across the concrete. Saw 92 is arranged at one end of a shaft 123, see Fig. 4, the other end of this shaft having a double pulley 124 for the double belt from the pulley 126 on the engine 91. Pulley 126 has a similar pair of belts 127 and drive for saw 93.

Saw 92and its shaft 123 are mounted on an extension 128 of the carriage 90, and saw 93 and its shaft 129 are carried by a similar extension 130, so that when the carriage 90 is at each limit of its travel on the track 25, one or the other of these saws, as shown in Fig. 2 and saw 93, will extend beyond the end of the track 25 in position to cut the outer edge 131 of the concrete. The same applies to saw 92 at the end of its outward travel. The extensions 128 and extend from the base of the carriage 90. The engine 91 rests on base 135, the base 135 and the extensions 128 and 130 being below the level of the track 25.

The saws 92, 93 are lubricated by water from nozzles 98, 99 supplied by flexible or other pipes shown by 100 in Fig. 8. The water pump 101 is driven from engine 20 by belt 122 and supplies water under pressure from the water tank 102, see Fig. 1, to the pipe 100 under control of valve 103 controlled by handle 104 at the operators position 14. The carriage 90 has a guard like 105 for each saw.

The carriage 90 for the saws 92 and 93 is traversed along track 25 by means of a cable 106 operated by drum 107, see Fig. 8. Drum 107 is connected by bevel gears 131, see Fig. 16, to a variable speed transmission 108 driven through pulley and belt 109 by engine 20, see Fig, 8. A clutch in the transmission 108 is controlled by handle 110 at the operators position 14 and a speed adjustment handle 111 is provided.

Cable 106 passes around pulleys 112 and 113, see Fig. 8, on the carriage 1, one portion of this cable as shown at 114 in Fig. 14 passing around a pulley on the carriage through a spring 116 as shown in Fig. 1 at one side of the carriage 90, the other portion 117 of cable 106 passing around a pulley 118, see Fig. 14, around pulleys 119 and 120, see Fig. 11, to the other side of carriage 90 through a turn buckle 121.

Thus the operator who drives the carriage may also operate the various controls for the saws.

Various modifications may be made in the invention without departing from the spirit of the following claims.

I claim:

1. A concrete sawing machine comprising a self-propelled vehicle having an engine and a frame, a transverse track for said vehicle, means pivotal'ly supporting one end of said track on said frame, a roller support on said frame on the other end of said track, a sliding support between said last-mentioned end of said track and said roller support, an engine driven saw device having a carriage having a roller suspension on said track, and a drive connected to said other end of said track for shifting said track.

2. Means for making two conjoining saw cuts extending the full width of a concrete roadway having forms at the opposite sides of the roadway, said means comprising a vehicle having wheels spaced apart a sufiicient distance to ride lengthwise of the roadway on said forms, said vehicle having an engine and a frame and a trans verse track on said frame, a carriage having a roller suspension on said track, said carriage having a base below said track and an extension at each side of said base, a saw engine on said base, a saw spindle on each of said extensions, a drive between said saw engines and said spindles, said spindles each comprising means for holding a saw with said saws in substantial alignment transversely of said vehicle, said track supporting said carriage with said saws in position to make connecting portions of a continuous saw cut extending across said full width and through the opposite sides of the roadway, and means driven by said vehicle engine for traversing said carriage on said track, said wheels comprising means supporting said vehicle on said side forms and off from the roadway being cut by said saws.

3. Means for making two conjoining saw cuts extending the full width of a concrete roadway having forms at the opposite sides of the roadway, said means comprising a vehicle having wheels spaced apart a sufficient distance to ride lengthwise of the roadway on said forms, said vehicle having an engine and a frame and a transverse track on said frame, .a carriage having a roller suspension on said track, said carriage having a base below said track and an extension at each side of said base, a saw engine on said base, a saw spindle on each of said extensions, a drive between said saw engines and said spindles, said spindles each comprising means for bold ing a saw with said saws in substantial alignment transversely of said vehicle, said track supporting said carriage with said saws in position to make connecting portions of a continuous saw cut extending across said full width and through the opposite sides of the roadway, and means driven by said vehicle engine for traversing said carriage on said track, said wheels comprising means supporting said vehicle on said side forms and 01f from the roadway being cut by said saws, certain of said wheels being rear wheels driven by said vehicle engine and arranged at opposite sides of said vehicle, and separate controls for said rear wheels respectively for maintaining the vehicle on said side forms while said vehicle is traveling along the roadway.

4. Means for making two conjoining saw cuts extending the full width of a concrete roadway having forms at the opposite sides of the roadway, said means comprising a vehicle having wheels spaced apart a suflicicnt distance to ride lengthwise of the roadway on said forms, said vehicle having an engine and a frame and a transverse track on said frame, a carriage having a roller suspension on said track, said carriage having a base below said track and an extension at each side of said base, a saw engine on said base, a saw spindle on each of said extensions, a drive between said saw engines and said spindles, said spindles each comprising means for holding a saw with said saws in substantial alignment transversely of said vehicle, said track supporting said carriage with said saws in position to make connecting portions of a continuous saw cut extending across said full width and through the opposite sides of the roadway, and means driven by said vehicle engine for traversing said carriage on said track, said wheels comprising means supporting said vehicle on said side forms and off from the roadway being cut by said saws, certain of said wheels being rear wheels driven by said vehicle engine and arranged at opposite sides of said vehicle, and separate con trols for said rear wheels respectively for maintaining the vehicle on said side forms while said vehicle is traveling along the roadway, each of said vehicle wheels having a guard wheel of smaller diameter and arranged out of normal engagement with the roadway when said vehicle wheels are riding on said side forms, said guard wheels being in position to support said saws above the roadway if any one of said vehicle wheels runs off said side forms.

5. A sawing machine comprising a vehicle having wheels at its opposite sides and having a track, a carriage having a roller suspension on said track, said carriage having an extension at each end thereof extending beyond one end or the other of said track when said roller suspension is at the corresponding end of said track, a saw spindle on each of said extension, each spindle having a saw extending through the line between the wheels at one side or the other of said vehicle when said carriage is at the corresponding end of said track, an engine on said carriage for driving said spindles, and

. means for driving said carriage, said track supporting said carriage with said saws in aligned position to make connecting portions of a continuous saw cut extending across the full width of and beyond the wheels at the opposite sides of the vehicle.

References Cited in the file of this patent UNITED STATES PATENTS 567,821 Emig Sept. 15, 1896 659,867 Hetherington Oct. 16, 1900 689,064 Butler Dec. 17, 1901 810,722 Cook Jan. 23, 1906 829,508 Cronkhite et al. Aug. 28, 1906 1,130,007 Nagle Mar. 2, 1915 1,375,960 Harris Apr. 26, 1921 2,311,891 Tyson Feb. 23, 1943 2,364,879 Talboys Dec. 12, 1944 2,382,971 Brocco et a1 Aug. 21, 1945 2,438,159 Faber Mar. 23, 1948 2,489,420 Kirk et al. NOV. 29, 1949 2,502,043 Howard Mar. 28, 1950 2,569,682 Lewis Oct. 2, 1951 2,581,477 Franks Jan. 8, 1952 2,587,969 Cornett Mar. 4, 1952 2,589,554 Killian Mar. 18, 1952 2,613,955 White Oct. 14, 1952 

